Re: does module area require alignment? (Re: [PATCH] i386-qemu port)

[Robert Millan]

On Sun, Jun 21, 2009 at 03:08:19PM -0400, Pavel Roskin wrote:
> On Sun, 2009-06-21 at 20:50 +0200, Robert Millan wrote:
> 
> > Does anyone know why do we align ELF targets?  When I did the coreboot port,
> > the ELF part was based on existing Ieee1275 code, so I guess I just mimicked
> > it.  Is there some issue with non-i386 CPUs or with some Ieee1275
> > implementations that makes this alignment a requirement?
> 
> It was a hack for PowerPC openfirmware.  I don't know why it was needed.
> I didn't have time and desire to debug openfirmware to find out what it
> wants.

Is the hack you're referring to GRUB_MOD_GAP, GRUB_MOD_ALIGN or both?

Btw, I suspect GRUB_MOD_GAP might be related to the modules overlapping with
the BSS because of a firmware loader bug.  Is there a correlation between
the needed GRUB_MOD_GAP and the BSS size?

-- 
Robert Millan

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